* Infer annotations from converters
* Use semantic newlines
* Add 787.change.rst
* Don't let type annotations override converters
* Make pipe() infer type annotations
* Use PY2 instead of sys.versioninfo >= (3, 3)
* Avert crashing with a nullary converter
* Small doc change
* Add type inference for optional()
* Make pipe() annotations actually work
Co-authored-by: Hynek Schlawack <hs@ox.cx>
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